File:The Journal of experimental zoology (1905) (14757053696).jpg

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Identifier: journalofexperim02harr (find matches)
Title: The Journal of experimental zoology
Year: 1905 (1900s)
Authors: Harrison, Ross G. (Ross Granville), 1870-1959 Brooks, William Keith, 1848-1908 Wistar Institute of Anatomy and Biology American Society of Zoologists
Subjects: Zoology
Publisher: (New York, etc.) Wiley-Liss (etc.)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Fig. 16.Hydroides dianthus. Age, 34 days. Dorsal view (X38). On left side is functional operculumof Serpula type with naked stalk and cup with one row of serrations. On right side is rudimentary buddeveloped from the base of the cast-off second branchia of that side. The three pairs of typical branchiaealso are shown. The condition at this time resembles very closely that of the adultSerpula, as the functional operculum as shown in Fig. l6 is withoutdoubt of the Serpula type. The further changes were not followedin H. dianthus, the species at Cold Spring Harbor, but were madeout in the two Naples species, H. pectinata and H. uncinata. Compensatory Regulation. 49
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Fig. 17.A—H. dianthus. Age, 34 days. Primary rudimentary operculum, right side ( X 50). B—H.pectinata. Age, 45 days. Dorsal view. Functional operculum of Serpula type on left. Rudimentaryoperculum on right. Pinnules are shown in only one branchia, the other branchiae being essentiallysimilar to this one. C—Tube of H. pectinata. Age, 45 days ( X 6). D—Hydroides uncinata. Age,46 days. Ventral view. Shows Serpula type of functional operculum on left side and rudimentaryoperculum on right. E—Diagram of cross-section of a branchia of H. uncinata showing method ofattachment of pinnules. F—H. uncinata. Age, 179 days or nearly six months. Original or Primaryfunctional operculum as appearing after it has dropped off. 50 Charles Zeleny. Evidently the adult condition with an operculum situated on eitherthe right or the left side and having two rows of processes at itsdistal end is not fully explained by the Cold Spring Harborobservations. Only three larvae out of a great many sets of

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